# -*- coding: utf-8 -*-

# Scrapy settings for JNSNewsSpider project
#
# For simplicity, this file contains only settings considered important or
# commonly used. You can find more settings consulting the documentation:
#
#     https://docs.scrapy.org/en/latest/topics/settings.html
#     https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
#     https://docs.scrapy.org/en/latest/topics/spider-middleware.html

BOT_NAME = 'JNSNewsSpider'

SPIDER_MODULES = ['JNSNewsSpider.spiders']
NEWSPIDER_MODULE = 'JNSNewsSpider.spiders'


# Crawl responsibly by identifying yourself (and your website) on the user-agent
#USER_AGENT = 'JNSNewsSpider (+http://www.yourdomain.com)'

# Obey robots.txt rules
ROBOTSTXT_OBEY = False

DOWNLOAD_TIMEOUT = 15

# Configure maximum concurrent requests performed by Scrapy (default: 16)
CONCURRENT_REQUESTS = 128

# Configure a delay for requests for the same website (default: 0)
# See https://docs.scrapy.org/en/latest/topics/settings.html#download-delay
# See also autothrottle settings and docs
DOWNLOAD_DELAY = 0
# The download delay setting will honor only one of:
CONCURRENT_REQUESTS_PER_DOMAIN = 128
CONCURRENT_REQUESTS_PER_IP = 128

# Disable cookies (enabled by default)
#COOKIES_ENABLED = False

# Disable Telnet Console (enabled by default)
#TELNETCONSOLE_ENABLED = False

# Override the default request headers:
#DEFAULT_REQUEST_HEADERS = {
#   'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
#   'Accept-Language': 'en',
#}

# Enable or disable spider middlewares
# See https://docs.scrapy.org/en/latest/topics/spider-middleware.html
#SPIDER_MIDDLEWARES = {
#    'JNSNewsSpider.middlewares.JnsnewsspiderSpiderMiddleware': 543,
#}

# Enable or disable downloader middlewares
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
DOWNLOADER_MIDDLEWARES = {
#    'JNSNewsSpider.middlewares.JnsnewsspiderDownloaderMiddleware': 543,
     'JNSNewsSpider.middlewares.SimpleProxyMiddleware': 100,
}

# Enable or disable extensions
# See https://docs.scrapy.org/en/latest/topics/extensions.html
#EXTENSIONS = {
#    'scrapy.extensions.telnet.TelnetConsole': None,
#}

# Configure item pipelines
# See https://docs.scrapy.org/en/latest/topics/item-pipeline.html
#ITEM_PIPELINES = {
#    'JNSNewsSpider.pipelines.JnsnewsspiderPipeline': 300,
#}

# Enable and configure the AutoThrottle extension (disabled by default)
# See https://docs.scrapy.org/en/latest/topics/autothrottle.html
#AUTOTHROTTLE_ENABLED = True
# The initial download delay
#AUTOTHROTTLE_START_DELAY = 5
# The maximum download delay to be set in case of high latencies
#AUTOTHROTTLE_MAX_DELAY = 60
# The average number of requests Scrapy should be sending in parallel to
# each remote server
#AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
# Enable showing throttling stats for every response received:
#AUTOTHROTTLE_DEBUG = False

# Enable and configure HTTP caching (disabled by default)
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings
HTTPCACHE_ENABLED = True
HTTPCACHE_EXPIRATION_SECS = 86400
HTTPCACHE_DIR = 'httpcache'
#HTTPCACHE_IGNORE_HTTP_CODES = []
HTTPCACHE_STORAGE = 'scrapy.extensions.httpcache.FilesystemCacheStorage'
# 是否启用缓存策略

# 缓存策略：所有请求均缓存，下次在请求直接访问原来的缓存即可
# HTTPCACHE_POLICY = "scrapy.extensions.httpcache.DummyPolicy"
#缓存策略：根据Http响应头：Cache-Control、Last-Modified 等进行缓存的策略
HTTPCACHE_POLICY = "scrapy.extensions.httpcache.RFC2616Policy"

RETRY_TIMES = 2

DEPTH_LIMIT = 20
# 14. 爬取时，0表示深度优先Lifo(默认)；1表示广度优先FiFo
DEPTH_PRIORITY = 1


# 修改编码为utf-8
FEED_EXPORT_ENCODING = 'utf-8'

# 24小时*3600秒 = 86400
CLOSESPIDER_TIMEOUT = 7200   

#CLOSESPIDER_TIMEOUT（秒）：在指定时间过后，就终止爬虫程序.
#CLOSESPIDER_ITEMCOUNT：抓取了指定数目的Item之后，就终止爬虫程序.
#CLOSESPIDER_PAGECOUNT：在收到了指定数目的响应之后，就终止爬虫程序.
#CLOSESPIDER_ERRORCOUNT：在发生了指定数目的错误之后，就终止爬虫程序.



